@article{DAN_1967_172_4_a2,
     author = {B. R. Vainberg and V. V. Grushin},
     title = {Uniformly non-coercive problems for elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {759--762},
     publisher = {mathdoc},
     volume = {172},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_4_a2/}
}